I've worked through the steps outlined by Oleg (e.g., support) and am still unable to see video in BM Media Express. Up until the Mac OSX update to 10.13.2, I had no issues capturing video. The device is recognized by the system, and when I unplug the Thunderbolt cable (Apple), it goes away:
UltraStudio Mini Recorder:
Vendor Name: Blackmagic Design
Device Name: UltraStudio Mini Recorder
Vendor ID: 0x4
Device ID: 0xA129
Device Revision: 0x1
UID: 0x0004000000858160
Route String: 1
Firmware Version: 7.2
Port (Upstream):
Status: Device connected
Link Status: 0x2
Speed: Up to 10 Gb/s x1
Port Micro Firmware Version: 0.2.5
Cable Firmware Version: 1.0.16
Cable Serial Number: C4M650100CMFQ7NA4
What is not clear to me is the steps to install and get it working based on Oleg's comments. With OSX 10.13.2, you can't install without allowing the install to continue from System Preferences, Security and Privacy. That being the case, how do you reinstall, restart, and then allow the installation - these steps don't match what I'm seeing in 10.13.2?